Carbon monoxide alarms required pursuant to section 908.7 of the New York city building code or sections 27-981.1, 27-981.2 and 27-981.3 of the 1968 building code shall be replaced when the time elapsed since the installation of such alarm exceeds the manufacturer's suggested useful life of the alarm.

Exception:
A carbon monoxide alarm installed prior to the effective date of this article shall be replaced when the time elapsed since the installation of such alarm exceeds the manufacturer’s suggested useful life of the alarm or within 6 months after the effective date of this article, whichever is later.

All carbon monoxide alarms installed after the effective date of this article shall comply with UL 2034 and be of a type that emits an audible notification at the expiration of the useful life of such alarm.

Smoke alarms required pursuant to section 907.2 of the New York city building code or sections 27-978, 27-979, 27-980 and 27-981 of the 1968 building code shall be replaced when the time elapsed since the installation of such alarm exceeds the manufacturer's suggested useful life of the alarm.

Exception: A smoke alarm installed prior to the effective date of this section and whose end of useful life is not known shall be replaced with an alarm that complies with section 28-312.5 within 7 years after the effective date of this section.

All smoke alarms installed after the effective date of this section shall comply with UL 217, shall employ a non-removable, non-replaceable battery that powers the alarm for a minimum of 10 years, and shall be of the type that emits an audible notification at the expiration of the useful life of the alarm.

Natural gas alarms required pursuant to
section 908.10 of the New York city building code shall be replaced when the time elapsed since
the installation of such alarm exceeds the manufacturer’s suggested useful life of the alarm.

All natural gas
alarms installed after the effective date of the local law that added this section 28-312.7 shall
comply with a standard established or adopted by department rule and shall be of the type that
emits an audible notification at the expiration of the useful life of the alarm.